Prof. Hisamatsu Nakano

Hosei University, Japan

Abstract: Formation of a null field point within a radiation pattern and formation of a tilted beam have been receiving considerable attention, in response to recent developments in communication systems. This seminar presents recent progress in technology for beam forming and is composed of three chapters. Chapter 1 discusses a circularly polarized (CP) spiral antenna whose radiation pattern is designed to have a null field point, which contributes to minimizing signal interference from nearby electronic devices. Chapter 2 investigates an antenna structure composed of metamaterial lines and a patch element. The height of this antenna structure is much smaller than that of the spiral antenna in Chapter 1. Each metamaterial line radiates a CP wave off the broadside direction (normal to the line); and the patch element radiates a CP wave in the broadside direction (normal to the patch plane). A null field point is created within the CP broadside radiation. Chapter 3 proposes formation of a tilted beam by a metasurface plane made of inhomogeneous loops. The formation is based on Fabry-Perot resonance. The direction of the tilted beam with increase in the number of metasurface planes is investigated.

Date: 2:30pm to 3:30pm, 15 JAN 2020

Venue: E3-06-01 Seminar Room, Engineering Block E3, Faculty of Engineering, National University of Singapore